<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h3>int 是 {{int|add:'2'}}</h3>
<h3>str 是 {{str|upper}}</h3>
<h3>lst 是 {{lst|lower}}</h3>
<h3>lst 是 {{lst.0}}</h3>
<h3>dict 是 {{dict}}</h3>
<h3>dict['a'] 是 {{dict.a}}</h3>
<h3>function 是 {{func}}</h3>
<h3>class_obj 是 {{class_obj.say}}</h3>
<h3>script 是 {{script|safe}}</h3>
</body>
</html>